thbirks

okay, so awhile back a purchased a roadbike frame over the internet to make into a fixed gear bike. The frame just sat around for several months until I managed to scrounge the other parts I needed. When I went to install the headset I found that a press wasn't needed. The cups went in by hand. well this didn't seem right so I examined the headtube and the front section of the bottom of the headtube looks thinner than the rest of the headtube. It looks like the headtube is ovalized.

I would like to use the frame anyway. I was able to adjust the headset just fine and the few miles that I have put on the bike reveal no problems with this ovalized headtube. So. Is it safe to use this frame? I've been told to shim the headtube with a peice of aluminum can. What do you think?